Key Facts
- Siege start
- 21 August 1573
- Siege end
- 8 October 1573
- Duration
- Approximately 48 days
- Spanish commander
- Don Fadrique, son of the Duke of Alba
- Dikes breached
- 23 September 1573, flooding Spanish camps
Strategic Narrative Overview
Spanish forces established their camp at Oudorp and besieged Alkmaar from 21 August 1573. The city's defenders, including a detachment of Scottish soldiers who had previously fought at Haarlem, repelled assaults using boiling tar and burning branches. On 23 September, William the Silent ordered the surrounding dikes to be breached, flooding the polders where Spanish troops were encamped, including the Achtermeer polder, severely undermining the besieging army.
01 / The Origins
The Siege of Alkmaar took place within the broader context of the Eighty Years' War, in which the Dutch provinces resisted Spanish Habsburg rule. Spain, under the Duke of Alba's harsh governance, had been systematically besieging and subduing Dutch cities. Alkmaar, a fortified city in Holland, became a target for the Spanish army under Don Fadrique as part of the campaign to crush Dutch resistance in 1573.
03 / The Outcome
Faced with flooded encampments and an untenable position, Don Fadrique ordered a retreat. The last Spanish soldiers withdrew on 8 October 1573. Alkmaar's successful resistance made it the first Dutch city to overcome a Spanish siege, boosting Dutch morale and demonstrating that flooding the lowlands could be an effective defensive strategy against Spanish military power in the ongoing war.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Don Fadrique.
Side B
1 belligerent
William the Silent.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.